#include<bits/stdc++.h>
/*#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353;*/
using namespace std;
using ll=long long;
using ul=unsigned long long;
int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1};
int dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};
using Graph=vector<vector<int>>;
int main(){
    char a;
    cin>>a;
    set<string>st;
    char u=a;
    for(int i=0;i<100;i++){
            string U="";
            U+=u,U+=a;
            cout<<"? "<<U<<endl;
        char C;string K;
        cin>>C>>K;
        if(C=='!')return 0;
        else u=K.back();
    }
}